<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>文件上传</title>
</head>

<body>
    <h2>文件上传</h2>
    <!-- form 文件上传必传的属性（enctype） -->
    <form action="/portrait" method="post" enctype="multipart/form-data">
        用户名：<input type="text" name="username"></br>
        头像：<input type="file" name="portrait"></br>
        </hr>
        <button>提交</button>
    </form>
</body>

</html>